Originally Posted by Demise

INA 204(l): https://www.uscis.gov/green-card/eli...ivingrelatives

https://www.ilrc.org/sites/default/f...e_to_covid.pdf

So all in all parents dying won't ruin the petition nor would it prevent you from getting an I-601A if you need one.

Worst case scenario you might need a substitute sponsor (depends if you're eligible to file I-864W). If you do need an I-864 then the substitute sponsor "must be a U.S. citizen, national, or lawful permanent resident; be at least 18 years old; and must be your spouse, parent, mother-in-law, father-in-law, sibling, child, son, daughter, son-in-law, daughter-in-law, sister-in-law, brother-in-law, grandparent, grandchild, or legal guardian".